S.M.
Dear L.,
I have had that problem with my 6 year old son when he was younger. All I did was give it time for him to sleep in his own bed. I know it is hard being a single parent because I am one myself. All it is, he is not use to the new bed. The toddler bed was his security; he was probably attached to the toddler bed and you switched it. It will take time but he will aventually sleep in his bed. As to the bed wetting thing, I have no advice for you there because I don't know anyone that has had that problem with kids. I know there are others out there that have experienced it but I didn't. Like I said about the bed, give it time and he will sleep in it. Maybe give him a stuffed animal to sleep with. He might think there is someone in his bed with him and stay there, that is what helped my son sleep in his bed by himself.
Hopefully everything works out for you. If this don't work then let me know maybe I can ask my sister because he had the same problem with her children.
S. M